"rust-lld: error: undefined symbol: _defmt_panic" and ".text load address range overlaps with .defmt."

[gustavowd]

I'm trying to start a embassy project for a STM32G4 microcontroller from scratch, but i'm facing an persistent error. When i try to compile with cargo build or cargo embed i'm getting the following error:

`a1af864f49" "--gc-sections" "-Tlink.x" = note: rust-lld: error: undefined symbol: _defmt_panic

referenced by mod.rs:133 (/home/gustavo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/defmt-0.3.6/src/export/mod.rs:133) /home/gustavo/embedded_rust/blinky/target/thumbv7em-none-eabihf/debug/deps/blinky-24951ba1af864f49.1e549mar4vimxyhk.rcgu.o:(embassy_executor::export::Arena$LT$$GT$::alloc::hdab4712089b2b616) referenced by mod.rs:133 (/home/gustavo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/defmt-0.3.6/src/export/mod.rs:133) /home/gustavo/embedded_rust/blinky/target/thumbv7em-none-eabihf/debug/deps/blinky-24951ba1af864f49.cprwdx9gysemz3b.rcgu.o:(embassy_executor::spawner::Spawner::must_spawn::ha10faf6f94b6545b) referenced by mod.rs:133 (/home/gustavo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/defmt-0.3.6/src/export/mod.rs:133) embassy_stm32-16eff0fd6274d331.embassy_stm32.f6033aee96536bb7-cgu.2.rcgu.o:(embassy_stm32::_generated::Peripherals::take_with_cs::h7e879cecd6fa453d) in archive /home/gustavo/embedded_rust/blinky/target/thumbv7em-none-eabihf/debug/deps/libembassy_stm32-16eff0fd6274d331.rlib referenced 18 more times

      rust-lld: error: section .defmt.{"package":"blinky","tag":"defmt_info","data":"Hello World!","disambiguator":"14157196540590754686","crate_name":"blinky"} virtual address range overlaps with .text
      >>> .defmt.{"package":"blinky","tag":"defmt_info","data":"Hello World!","disambiguator":"14157196540590754686","crate_name":"blinky"} range is [0x80001D8, 0x80001D8]
      >>> .text range is [0x80001D8, 0x800EC53]

      rust-lld: error: section .text virtual address range overlaps with .defmt.{"package":"blinky","tag":"defmt_info","data":"high","disambiguator":"5785278663893197478","crate_name":"blinky"}
      >>> .text range is [0x80001D8, 0x800EC53]
      >>> .defmt.{"package":"blinky","tag":"defmt_info","data":"high","disambiguator":"5785278663893197478","crate_name":"blinky"} range is [0x80001D9, 0x80001D9]

      rust-lld: error: section .defmt.{"package":"blinky","tag":"defmt_info","data":"Hello World!","disambiguator":"14157196540590754686","crate_name":"blinky"} load address range overlaps with .text
      >>> .defmt.{"package":"blinky","tag":"defmt_info","data":"Hello World!","disambiguator":"14157196540590754686","crate_name":"blinky"} range is [0x80001D8, 0x80001D8]
      >>> .text range is [0x80001D8, 0x800EC53]

      rust-lld: error: section .text load address range overlaps with .defmt.{"package":"blinky","tag":"defmt_info","data":"high","disambiguator":"5785278663893197478","crate_name":"blinky"}
      >>> .text range is [0x80001D8, 0x800EC53]
      >>> .defmt.{"package":"blinky","tag":"defmt_info","data":"high","disambiguator":"5785278663893197478","crate_name":"blinky"} range is [0x80001D9, 0x80001D9]

error: aborting due to 1 previous error

   Error Failed to run cargo build: exit code = Some(101).`

[main.rs] `use defmt::*; use embassy_executor::Spawner; use embassy_stm32::gpio::{Level, Output, Speed}; use embassy_time::Timer; use {defmtrtt as , panicprobe as };

[embassy_executor::main]

async fn main(_spawner: Spawner) { let p = embassy_stm32::init(Default::default()); info!("Hello World!");

let mut led = Output::new(p.PA5, Level::High, Speed::Low);

loop {
    info!("high");
    led.set_high();
    Timer::after_millis(300).await;

    info!("low");
    led.set_low();
    Timer::after_millis(300).await;
}

}`

[cargo.toml] `[package] name = "blinky" version = "0.1.0" edition = "2021"

[dependencies] cortex-m = { version = "0.7.7", features = ["critical-section-single-core"] } cortex-m-rt = "0.7.3"

panic-probe = { version = "0.3.1", features = ["print-defmt"] } futures = { version = "0.3.17", default-features = false, features = ["async-await"] } heapless = { version = "0.8", default-features = false } static_cell = "2.0.0"

embassy-stm32 = {version = "0.1.0", features = [ "defmt", "time-driver-any", "stm32g474re", "memory-x", "unstable-pac", "exti"] } embassy-sync = {version = "0.5.0", features = ["defmt"]} embassy-executor = {version = "0.5.0", features = ["arch-cortex-m", "executor-thread", "defmt", "integrated-timers"]} embassy-time = {version = "0.3.0", features = ["defmt", "defmt-timestamp-uptime", "tick-hz-32_768"]} embassy-futures = "0.1.0" defmt = "0.3.6" defmt-rtt = "0.4"

[profile.release] debug = 2`

[config.toml] `[build] target = "thumbv7em-none-eabihf"

[target.thumbv7em-none-eabihf] rustflags = ["-C", "link-arg=-Tlink.x"]

[env] DEFMT_LOG = "trace"`

Any ideais? Thanks in advance

[gustavowd]

The first one i was able to sove using:

[defmt::panic_handler]

fn panic() -> ! { core::panic!("panic via defmt::panic!") }

[Dirbaio]

you're missing -Tdefmt.x linker flag.

I suggest adding them via build.rs like the examples do, not via .cargo/config.toml.

[gustavowd]

Thanks @Dirbaio .

Just one more question. Why when inserting the build.rs file I no longer need to have a memory.x file? In fact, when maintaining the memory.x file I receive a message that the FLASH memory has already been declared elsewhere.

[Dirbaio]

memory-x feature in embassy-stm32 automatically provides a memory.x file. if you want to provide your own, you have to disble it.